Hardware Reference
In-Depth Information
Figure 12.3
Sample printed oscillator performance data
Figure 12.4
Typical crystal filter response characteristic
Testing crystal filters
The client is a manufacturer of RF passive components. Part of the company's
product range includes 10.7 MHz crystal filters of various types which are man-
ufactured to close tolerance in a batch process. Each filter is checked (on a
test jig) to determine whether it meets the design specification which includes
bandwidth (measured at
−
6 and
−
40 dB) and pass-band ripple. It is also
considered desirable to display the response of the filter graphically in order that
the ultimate stop-band attenuation can be gauged. Figure 12.4 shows a typical
filter response characteristic.
Specification
The company wishes to automate the process of filter measurement and, at
the same time, generate statistical information which can be used to check the
manufacturing process.
